The magnetic energy stored in an inductor of inductance $5 \mu H$ carrying a current of $2 \ A$ is

$(a)$ Obtain the expression for the magnetic energy stored in a solenoid in terms of magnetic field $B$,area $A$,and length $l$ of the solenoid.
$(b)$ How does this magnetic energy compare with the electrostatic energy stored in a capacitor?

The energy stored in a $50 mH$ inductor carrying a current of $4 A$ is (in $J$)

If the current in a coil is halved,then the energy stored becomes how many times the previous value?

The magnetic energy stored in an inductor of inductance $4\,\mu H$ carrying a current of $2\,A$ is:

An inductor may store energy in